git.oblomov.eu Git - wine/blob - dlls/sane.ds/capability.c

   1 /*
   2  * Copyright 2000 Corel Corporation
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #define NONAMELESSUNION
  20 #define NONAMELESSSTRUCT
  21
  22 #include "config.h"
  23
  24 #include <stdarg.h>
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "twain.h"
  29 #include "sane_i.h"
  30 #include "wine/debug.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(twain);
  33
  34 static TW_UINT16 get_onevalue(pTW_CAPABILITY pCapability, TW_UINT16 *type, TW_UINT32 *value)
  35 {
  36     if (pCapability->hContainer)
  37     {
  38         pTW_ONEVALUE pVal = GlobalLock (pCapability->hContainer);
  39         if (pVal)
  40         {
  41             *value = pVal->Item;
  42             if (type)
  43                 *type = pVal->ItemType;
  44             GlobalUnlock (pCapability->hContainer);
  45             return TWCC_SUCCESS;
  46         }
  47     }
  48     return TWCC_BUMMER;
  49 }
  50
  51
  52 static TW_UINT16 set_onevalue(pTW_CAPABILITY pCapability, TW_UINT16 type, TW_UINT32 value)
  53 {
  54     pCapability->hContainer = GlobalAlloc (0, sizeof(TW_ONEVALUE));
  55
  56     if (pCapability->hContainer)
  57     {
  58         pTW_ONEVALUE pVal = GlobalLock (pCapability->hContainer);
  59         if (pVal)
  60         {
  61             pCapability->ConType = TWON_ONEVALUE;
  62             pVal->ItemType = type;
  63             pVal->Item = value;
  64             GlobalUnlock (pCapability->hContainer);
  65             return TWCC_SUCCESS;
  66         }
  67     }
  68    return TWCC_LOWMEMORY;
  69 }
  70
  71 static TW_UINT16 msg_set(pTW_CAPABILITY pCapability, TW_UINT32 *val)
  72 {
  73     if (pCapability->ConType == TWON_ONEVALUE)
  74         return get_onevalue(pCapability, NULL, val);
  75
  76     FIXME("Partial Stub:  MSG_SET only supports TW_ONEVALUE\n");
  77     return TWCC_BADCAP;
  78 }
  79
  80
  81 static TW_UINT16 msg_get_enum(pTW_CAPABILITY pCapability, const TW_UINT32 *values, int value_count,
  82                               TW_UINT16 type, TW_UINT32 current, TW_UINT32 default_value)
  83 {
  84     TW_ENUMERATION *enumv = NULL;
  85     TW_UINT32 *p32;
  86     TW_UINT16 *p16;
  87     int i;
  88
  89     pCapability->ConType = TWON_ENUMERATION;
  90     pCapability->hContainer = 0;
  91
  92     if (type == TWTY_INT16 || type == TWTY_UINT16)
  93         pCapability->hContainer = GlobalAlloc (0, FIELD_OFFSET( TW_ENUMERATION, ItemList[value_count * sizeof(TW_UINT16)]));
  94
  95     if (type == TWTY_INT32 || type == TWTY_UINT32)
  96         pCapability->hContainer = GlobalAlloc (0, FIELD_OFFSET( TW_ENUMERATION, ItemList[value_count * sizeof(TW_UINT32)]));
  97
  98     if (pCapability->hContainer)
  99         enumv = GlobalLock(pCapability->hContainer);
 100
 101     if (! enumv)
 102         return TWCC_LOWMEMORY;
 103
 104     enumv->ItemType = type;
 105     enumv->NumItems = value_count;
 106
 107     p16 = (TW_UINT16 *) enumv->ItemList;
 108     p32 = (TW_UINT32 *) enumv->ItemList;
 109     for (i = 0; i < value_count; i++)
 110     {
 111         if (values[i] == current)
 112             enumv->CurrentIndex = i;
 113         if (values[i] == default_value)
 114             enumv->DefaultIndex = i;
 115         if (type == TWTY_INT16 || type == TWTY_UINT16)
 116             p16[i] = values[i];
 117         if (type == TWTY_INT32 || type == TWTY_UINT32)
 118             p32[i] = values[i];
 119     }
 120
 121     GlobalUnlock(pCapability->hContainer);
 122     return TWCC_SUCCESS;
 123 }
 124
 125 #ifdef SONAME_LIBSANE
 126 static TW_UINT16 msg_get_range(pTW_CAPABILITY pCapability, TW_UINT16 type,
 127             TW_UINT32 minval, TW_UINT32 maxval, TW_UINT32 step, TW_UINT32 def,  TW_UINT32 current)
 128 {
 129     TW_RANGE *range = NULL;
 130
 131     pCapability->ConType = TWON_RANGE;
 132     pCapability->hContainer = 0;
 133
 134     pCapability->hContainer = GlobalAlloc (0, sizeof(*range));
 135     if (pCapability->hContainer)
 136         range = GlobalLock(pCapability->hContainer);
 137
 138     if (! range)
 139         return TWCC_LOWMEMORY;
 140
 141     range->ItemType = type;
 142     range->MinValue = minval;
 143     range->MaxValue = maxval;
 144     range->StepSize = step;
 145     range->DefaultValue = def;
 146     range->CurrentValue = current;
 147
 148     GlobalUnlock(pCapability->hContainer);
 149     return TWCC_SUCCESS;
 150 }
 151 #endif
 152
 153 static TW_UINT16 TWAIN_GetSupportedCaps(pTW_CAPABILITY pCapability)
 154 {
 155     TW_ARRAY *a;
 156     static const UINT16 supported_caps[] = { CAP_SUPPORTEDCAPS, CAP_XFERCOUNT, CAP_UICONTROLLABLE,
 157                     ICAP_XFERMECH, ICAP_PIXELTYPE, ICAP_UNITS, ICAP_BITDEPTH, ICAP_COMPRESSION, ICAP_PIXELFLAVOR,
 158                     ICAP_XRESOLUTION, ICAP_YRESOLUTION };
 159
 160     pCapability->hContainer = GlobalAlloc (0, FIELD_OFFSET( TW_ARRAY, ItemList[sizeof(supported_caps)] ));
 161     pCapability->ConType = TWON_ARRAY;
 162
 163     if (pCapability->hContainer)
 164     {
 165         UINT16 *u;
 166         int i;
 167         a = GlobalLock (pCapability->hContainer);
 168         a->ItemType = TWTY_UINT16;
 169         a->NumItems = sizeof(supported_caps) / sizeof(supported_caps[0]);
 170         u = (UINT16 *) a->ItemList;
 171         for (i = 0; i < a->NumItems; i++)
 172             u[i] = supported_caps[i];
 173         GlobalUnlock (pCapability->hContainer);
 174         return TWCC_SUCCESS;
 175     }
 176     else
 177         return TWCC_LOWMEMORY;
 178 }
 179
 180
 181 /* ICAP_XFERMECH */
 182 static TW_UINT16 SANE_ICAPXferMech (pTW_CAPABILITY pCapability, TW_UINT16 action)
 183 {
 184     static const TW_UINT32 possible_values[] = { TWSX_NATIVE, TWSX_MEMORY };
 185     TW_UINT32 val;
 186     TW_UINT16 twCC = TWCC_BADCAP;
 187
 188     TRACE("ICAP_XFERMECH\n");
 189
 190     switch (action)
 191     {
 192         case MSG_QUERYSUPPORT:
 193             twCC = set_onevalue(pCapability, TWTY_INT32,
 194                     TWQC_GET | TWQC_SET | TWQC_GETDEFAULT | TWQC_GETCURRENT | TWQC_RESET );
 195             break;
 196
 197         case MSG_GET:
 198             twCC = msg_get_enum(pCapability, possible_values, sizeof(possible_values) / sizeof(possible_values[0]),
 199                     TWTY_UINT16, activeDS.capXferMech, TWSX_NATIVE);
 200             break;
 201
 202         case MSG_SET:
 203             twCC = msg_set(pCapability, &val);
 204             if (twCC == TWCC_SUCCESS)
 205             {
 206                activeDS.capXferMech = (TW_UINT16) val;
 207                FIXME("Partial Stub:  XFERMECH set to %d, but ignored\n", val);
 208             }
 209             break;
 210
 211         case MSG_GETDEFAULT:
 212             twCC = set_onevalue(pCapability, TWTY_UINT16, TWSX_NATIVE);
 213             break;
 214
 215         case MSG_RESET:
 216             activeDS.capXferMech = TWSX_NATIVE;
 217             /* .. fall through intentional .. */
 218
 219         case MSG_GETCURRENT:
 220             twCC = set_onevalue(pCapability, TWTY_UINT16, activeDS.capXferMech);
 221             FIXME("Partial Stub:  XFERMECH of %d not actually used\n", activeDS.capXferMech);
 222             break;
 223     }
 224     return twCC;
 225 }
 226
 227
 228 /* CAP_XFERCOUNT */
 229 static TW_UINT16 SANE_CAPXferCount (pTW_CAPABILITY pCapability, TW_UINT16 action)
 230 {
 231     TW_UINT32 val;
 232     TW_UINT16 twCC = TWCC_BADCAP;
 233
 234     TRACE("CAP_XFERCOUNT\n");
 235
 236     switch (action)
 237     {
 238         case MSG_QUERYSUPPORT:
 239             twCC = set_onevalue(pCapability, TWTY_INT32,
 240                     TWQC_GET | TWQC_SET | TWQC_GETDEFAULT | TWQC_GETCURRENT | TWQC_RESET );
 241             break;
 242
 243         case MSG_GET:
 244             twCC = set_onevalue(pCapability, TWTY_INT16, -1);
 245             FIXME("Partial Stub:  Reporting only support for transfer all\n");
 246             break;
 247
 248         case MSG_SET:
 249             twCC = msg_set(pCapability, &val);
 250             if (twCC == TWCC_SUCCESS)
 251                FIXME("Partial Stub:  XFERCOUNT set to %d, but ignored\n", val);
 252             break;
 253
 254         case MSG_GETDEFAULT:
 255             twCC = set_onevalue(pCapability, TWTY_INT16, -1);
 256             break;
 257
 258         case MSG_RESET:
 259             /* .. fall through intentional .. */
 260
 261         case MSG_GETCURRENT:
 262             twCC = set_onevalue(pCapability, TWTY_INT16, -1);
 263             break;
 264     }
 265     return twCC;
 266 }
 267
 268 /* ICAP_PIXELTYPE */
 269 static TW_UINT16 SANE_ICAPPixelType (pTW_CAPABILITY pCapability, TW_UINT16 action)
 270 {
 271     static const TW_UINT32 possible_values[] = { TWPT_BW, TWPT_GRAY, TWPT_RGB };
 272     TW_UINT32 val;
 273     TW_UINT16 twCC = TWCC_BADCAP;
 274
 275     TRACE("ICAP_PIXELTYPE\n");
 276
 277     switch (action)
 278     {
 279         case MSG_QUERYSUPPORT:
 280             twCC = set_onevalue(pCapability, TWTY_INT32,
 281                     TWQC_GET | TWQC_SET | TWQC_GETDEFAULT | TWQC_GETCURRENT | TWQC_RESET );
 282             break;
 283
 284         case MSG_GET:
 285             twCC = msg_get_enum(pCapability, possible_values, sizeof(possible_values) / sizeof(possible_values[0]),
 286                     TWTY_UINT16, activeDS.capXferMech, TWPT_BW);
 287             break;
 288
 289         case MSG_SET:
 290             twCC = msg_set(pCapability, &val);
 291             if (twCC == TWCC_SUCCESS)
 292             {
 293                activeDS.capPixelType = (TW_UINT16) val;
 294                FIXME("Partial Stub:  PIXELTYPE set to %d, but ignored\n", val);
 295             }
 296             break;
 297
 298         case MSG_GETDEFAULT:
 299             twCC = set_onevalue(pCapability, TWTY_UINT16, TWPT_BW);
 300             break;
 301
 302         case MSG_RESET:
 303             activeDS.capPixelType = TWPT_BW;
 304             /* .. fall through intentional .. */
 305
 306         case MSG_GETCURRENT:
 307             twCC = set_onevalue(pCapability, TWTY_UINT16, activeDS.capPixelType);
 308             break;
 309     }
 310
 311     return twCC;
 312 }
 313
 314 /* ICAP_UNITS */
 315 static TW_UINT16 SANE_ICAPUnits (pTW_CAPABILITY pCapability, TW_UINT16 action)
 316 {
 317     TW_UINT32 val;
 318     TW_UINT16 twCC = TWCC_BADCAP;
 319
 320     TRACE("ICAP_UNITS\n");
 321
 322     switch (action)
 323     {
 324         case MSG_QUERYSUPPORT:
 325             twCC = set_onevalue(pCapability, TWTY_INT32,
 326                     TWQC_GET | TWQC_SET | TWQC_GETDEFAULT | TWQC_GETCURRENT | TWQC_RESET );
 327             break;
 328
 329         case MSG_GET:
 330             twCC = set_onevalue(pCapability, TWTY_UINT16, TWUN_INCHES);
 331             break;
 332
 333         case MSG_SET:
 334             twCC = msg_set(pCapability, &val);
 335             if (twCC == TWCC_SUCCESS)
 336             {
 337                 if  (val != TWUN_INCHES)
 338                 {
 339                     ERR("Sane supports only SANE_UNIT_DPI\n");
 340                     twCC = TWCC_BADVALUE;
 341                 }
 342             }
 343             break;
 344
 345         case MSG_GETDEFAULT:
 346         case MSG_RESET:
 347             /* .. fall through intentional .. */
 348
 349         case MSG_GETCURRENT:
 350             twCC = set_onevalue(pCapability, TWTY_UINT16, TWUN_INCHES);
 351             break;
 352     }
 353
 354     return twCC;
 355 }
 356
 357 /* ICAP_BITDEPTH */
 358 static TW_UINT16 SANE_ICAPBitDepth(pTW_CAPABILITY pCapability, TW_UINT16 action)
 359 {
 360     TW_UINT16 twCC = TWCC_BADCAP;
 361 #ifdef SONAME_LIBSANE
 362     TW_UINT32 possible_values[1];
 363
 364     TRACE("ICAP_BITDEPTH\n");
 365
 366     possible_values[0] = activeDS.sane_param.depth;
 367
 368     switch (action)
 369     {
 370         case MSG_QUERYSUPPORT:
 371             twCC = set_onevalue(pCapability, TWTY_INT32,
 372                     TWQC_GET | TWQC_GETDEFAULT | TWQC_GETCURRENT  );
 373             break;
 374
 375         case MSG_GET:
 376             twCC = msg_get_enum(pCapability, possible_values, sizeof(possible_values) / sizeof(possible_values[0]),
 377                     TWTY_UINT16, activeDS.sane_param.depth, activeDS.sane_param.depth);
 378             break;
 379
 380         case MSG_GETDEFAULT:
 381             /* .. Fall through intentional .. */
 382
 383         case MSG_GETCURRENT:
 384             twCC = set_onevalue(pCapability, TWTY_UINT16, activeDS.sane_param.depth);
 385             break;
 386     }
 387 #endif
 388     return twCC;
 389 }
 390
 391 /* CAP_UICONTROLLABLE */
 392 static TW_UINT16 SANE_CAPUiControllable(pTW_CAPABILITY pCapability, TW_UINT16 action)
 393 {
 394     TW_UINT16 twCC = TWCC_BADCAP;
 395
 396     TRACE("CAP_UICONTROLLABLE\n");
 397
 398     switch (action)
 399     {
 400         case MSG_QUERYSUPPORT:
 401             twCC = set_onevalue(pCapability, TWTY_INT32, TWQC_GET);
 402             break;
 403
 404         case MSG_GET:
 405             twCC = set_onevalue(pCapability, TWTY_BOOL, TRUE);
 406             break;
 407
 408     }
 409     return twCC;
 410 }
 411
 412 /* ICAP_COMPRESSION */
 413 static TW_UINT16 SANE_ICAPCompression (pTW_CAPABILITY pCapability, TW_UINT16 action)
 414 {
 415     static const TW_UINT32 possible_values[] = { TWCP_NONE };
 416     TW_UINT32 val;
 417     TW_UINT16 twCC = TWCC_BADCAP;
 418
 419     TRACE("ICAP_COMPRESSION\n");
 420
 421     switch (action)
 422     {
 423         case MSG_QUERYSUPPORT:
 424             twCC = set_onevalue(pCapability, TWTY_INT32,
 425                     TWQC_GET | TWQC_SET | TWQC_GETDEFAULT | TWQC_GETCURRENT | TWQC_RESET );
 426             break;
 427
 428         case MSG_GET:
 429             twCC = msg_get_enum(pCapability, possible_values, sizeof(possible_values) / sizeof(possible_values[0]),
 430                     TWTY_UINT16, TWCP_NONE, TWCP_NONE);
 431             FIXME("Partial stub:  We don't attempt to support compression\n");
 432             break;
 433
 434         case MSG_SET:
 435             twCC = msg_set(pCapability, &val);
 436             if (twCC == TWCC_SUCCESS)
 437                FIXME("Partial Stub:  COMPRESSION set to %d, but ignored\n", val);
 438             break;
 439
 440         case MSG_GETDEFAULT:
 441             twCC = set_onevalue(pCapability, TWTY_UINT16, TWCP_NONE);
 442             break;
 443
 444         case MSG_RESET:
 445             /* .. fall through intentional .. */
 446
 447         case MSG_GETCURRENT:
 448             twCC = set_onevalue(pCapability, TWTY_UINT16, TWCP_NONE);
 449             break;
 450     }
 451     return twCC;
 452 }
 453
 454 /* ICAP_XRESOLUTION, ICAP_YRESOLUTION  */
 455 static TW_UINT16 SANE_ICAPResolution (pTW_CAPABILITY pCapability, TW_UINT16 action,  TW_UINT16 cap)
 456 {
 457     TW_UINT16 twCC = TWCC_BADCAP;
 458 #ifdef SONAME_LIBSANE
 459     TW_UINT32 val;
 460     SANE_Int current_resolution;
 461     TW_FIX32 *default_res;
 462     const char *best_option_name;
 463     SANE_Int minval, maxval, quantval;
 464     SANE_Status sane_rc;
 465     SANE_Int set_status;
 466
 467     TRACE("ICAP_%cRESOLUTION\n", cap == ICAP_XRESOLUTION ? 'X' : 'Y');
 468
 469     /* Some scanners support 'x-resolution', most seem to just support 'resolution' */
 470     if (cap == ICAP_XRESOLUTION)
 471     {
 472         best_option_name = "x-resolution";
 473         default_res = &activeDS.defaultXResolution;
 474     }
 475     else
 476     {
 477         best_option_name = "y-resolution";
 478         default_res = &activeDS.defaultYResolution;
 479     }
 480     if (sane_option_get_int(activeDS.deviceHandle, best_option_name, &current_resolution) != SANE_STATUS_GOOD)
 481     {
 482         best_option_name = "resolution";
 483         if (sane_option_get_int(activeDS.deviceHandle, best_option_name, &current_resolution) != SANE_STATUS_GOOD)
 484             return TWCC_BADCAP;
 485     }
 486
 487     /* Sane does not support a concept of 'default' resolution, so we have to
 488      *   cache the resolution the very first time we load the scanner, and use that
 489      *   as the default */
 490     if (cap == ICAP_XRESOLUTION && ! activeDS.XResolutionSet)
 491     {
 492         default_res->Whole = current_resolution;
 493         default_res->Frac = 0;
 494         activeDS.XResolutionSet = TRUE;
 495     }
 496
 497     if (cap == ICAP_YRESOLUTION && ! activeDS.YResolutionSet)
 498     {
 499         default_res->Whole = current_resolution;
 500         default_res->Frac = 0;
 501         activeDS.YResolutionSet = TRUE;
 502     }
 503
 504     switch (action)
 505     {
 506         case MSG_QUERYSUPPORT:
 507             twCC = set_onevalue(pCapability, TWTY_INT32,
 508                     TWQC_GET | TWQC_SET | TWQC_GETDEFAULT | TWQC_GETCURRENT | TWQC_RESET );
 509             break;
 510
 511         case MSG_GET:
 512             sane_rc = sane_option_probe_resolution(activeDS.deviceHandle, best_option_name, &minval, &maxval, &quantval);
 513             if (sane_rc != SANE_STATUS_GOOD)
 514                 twCC = TWCC_BADCAP;
 515             else
 516                 twCC = msg_get_range(pCapability, TWTY_FIX32,
 517                                 minval, maxval, quantval == 0 ? 1 : quantval, default_res->Whole, current_resolution);
 518             break;
 519
 520         case MSG_SET:
 521             twCC = msg_set(pCapability, &val);
 522             if (twCC == TWCC_SUCCESS)
 523             {
 524                 TW_FIX32 f32;
 525                 memcpy(&f32, &val, sizeof(f32));
 526                 sane_rc = sane_option_set_int(activeDS.deviceHandle, best_option_name, f32.Whole, &set_status);
 527                 if (sane_rc != SANE_STATUS_GOOD)
 528                 {
 529                     FIXME("Status of %d not expected or handled\n", sane_rc);
 530                     twCC = TWCC_BADCAP;
 531                 }
 532                 else if (set_status == SANE_INFO_INEXACT)
 533                     twCC = TWCC_CHECKSTATUS;
 534             }
 535             break;
 536
 537         case MSG_GETDEFAULT:
 538             twCC = set_onevalue(pCapability, TWTY_FIX32, default_res->Whole);
 539             break;
 540
 541         case MSG_RESET:
 542             sane_rc = sane_option_set_int(activeDS.deviceHandle, best_option_name, default_res->Whole, NULL);
 543             if (sane_rc != SANE_STATUS_GOOD)
 544                 return TWCC_BADCAP;
 545
 546             /* .. fall through intentional .. */
 547
 548         case MSG_GETCURRENT:
 549             twCC = set_onevalue(pCapability, TWTY_FIX32, current_resolution);
 550             break;
 551     }
 552 #endif
 553     return twCC;
 554 }
 555
 556 /* ICAP_PIXELFLAVOR */
 557 static TW_UINT16 SANE_ICAPPixelFlavor (pTW_CAPABILITY pCapability, TW_UINT16 action)
 558 {
 559     static const TW_UINT32 possible_values[] = { TWPF_CHOCOLATE, TWPF_VANILLA };
 560     TW_UINT32 val;
 561     TW_UINT16 twCC = TWCC_BADCAP;
 562
 563     TRACE("ICAP_PIXELFLAVOR\n");
 564
 565     switch (action)
 566     {
 567         case MSG_QUERYSUPPORT:
 568             twCC = set_onevalue(pCapability, TWTY_INT32,
 569                     TWQC_GET | TWQC_SET | TWQC_GETDEFAULT | TWQC_GETCURRENT | TWQC_RESET );
 570             break;
 571
 572         case MSG_GET:
 573             twCC = msg_get_enum(pCapability, possible_values, sizeof(possible_values) / sizeof(possible_values[0]),
 574                     TWTY_UINT16, TWPF_CHOCOLATE, TWPF_CHOCOLATE);
 575             break;
 576
 577         case MSG_SET:
 578             twCC = msg_set(pCapability, &val);
 579             if (twCC == TWCC_SUCCESS)
 580             {
 581                FIXME("Stub:  PIXELFLAVOR set to %d, but ignored\n", val);
 582             }
 583             break;
 584
 585         case MSG_GETDEFAULT:
 586             twCC = set_onevalue(pCapability, TWTY_UINT16, TWPF_CHOCOLATE);
 587             break;
 588
 589         case MSG_RESET:
 590             /* .. fall through intentional .. */
 591
 592         case MSG_GETCURRENT:
 593             twCC = set_onevalue(pCapability, TWTY_UINT16, TWPF_CHOCOLATE);
 594             break;
 595     }
 596     return twCC;
 597 }
 598
 599
 600 TW_UINT16 SANE_SaneCapability (pTW_CAPABILITY pCapability, TW_UINT16 action)
 601 {
 602     TW_UINT16 twCC = TWCC_CAPUNSUPPORTED;
 603
 604     TRACE("capability=%d action=%d\n", pCapability->Cap, action);
 605
 606     switch (pCapability->Cap)
 607     {
 608         case CAP_SUPPORTEDCAPS:
 609             if (action == MSG_GET)
 610                 twCC = TWAIN_GetSupportedCaps(pCapability);
 611             else
 612                 twCC = TWCC_BADVALUE;
 613             break;
 614
 615         case CAP_XFERCOUNT:
 616             twCC = SANE_CAPXferCount (pCapability, action);
 617             break;
 618
 619         case CAP_UICONTROLLABLE:
 620             twCC = SANE_CAPUiControllable (pCapability, action);
 621             break;
 622
 623         case ICAP_PIXELTYPE:
 624             twCC = SANE_ICAPPixelType (pCapability, action);
 625             break;
 626
 627         case ICAP_UNITS:
 628             twCC = SANE_ICAPUnits (pCapability, action);
 629             break;
 630
 631         case ICAP_BITDEPTH:
 632             twCC = SANE_ICAPBitDepth(pCapability, action);
 633             break;
 634
 635         case ICAP_XFERMECH:
 636             twCC = SANE_ICAPXferMech (pCapability, action);
 637             break;
 638
 639         case ICAP_PIXELFLAVOR:
 640             twCC = SANE_ICAPPixelFlavor (pCapability, action);
 641             break;
 642
 643         case ICAP_COMPRESSION:
 644             twCC = SANE_ICAPCompression(pCapability, action);
 645             break;
 646
 647         case ICAP_XRESOLUTION:
 648             twCC = SANE_ICAPResolution(pCapability, action, pCapability->Cap);
 649             break;
 650
 651         case ICAP_YRESOLUTION:
 652             twCC = SANE_ICAPResolution(pCapability, action, pCapability->Cap);
 653             break;
 654     }
 655
 656     /* Twain specifies that you should return a 0 in response to QUERYSUPPORT,
 657      *   even if you don't formally support the capability */
 658     if (twCC == TWCC_CAPUNSUPPORTED && action == MSG_QUERYSUPPORT)
 659         twCC = set_onevalue(pCapability, 0, TWTY_INT32);
 660
 661     if (twCC == TWCC_CAPUNSUPPORTED)
 662         TRACE("capability 0x%x/action=%d being reported as unsupported\n", pCapability->Cap, action);
 663
 664     return twCC;
 665 }